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Chapter: Preface

Preface

From Release 6.1.1 onwards, Cisco introduces support for the
64-bit Linux-based IOS XR operating system. Extensive feature parity is
maintained between the 32-bit and 64-bit environments. Unless explicitly marked
otherwise, the contents of this document are applicable for both the
environments. For more details on Cisco IOS XR 64 bit, refer to the
Release Notes for
Cisco ASR 9000 Series
Routers, Release
6.1.1 document.